“"Dangerous" does not mean exciting or bold; it means likely to cause great harm. The most dangerous idea is the only dangerous idea: The idea that ideas can be dangerous.”
Daniel T. Gilbert (2007) in: John Brockman. What is your dangerous idea?: today's leading thinkers on the unthinkable. Harper Perennial, 2007, p. 42
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Daniel T. Gilbert 6
American psychologist 1957Related quotes
“Yes, books are dangerous. They should be dangerous - they contain ideas.”

“An idea that is not dangerous is unworthy of being called an idea at all.”
The Epigrams of Oscar Wilde, edited by Alvin Redman (1954)

“An idea that is not dangerous is not worthy of being called an idea at all.”
The Roycraft Dictionary and Book of Epigrams (1923)

“Nothing is more dangerous than an idea, when you have only one idea.”
Propos sur le Religion no. 74 (1938), under the pen name Alain.
Alternate translation: “Nothing is more dangerous than an idea, when it's the only one we have.” IZQuotes https://izquotes.com/quote/%C3%A9mile-chartier/nothing-is-more-dangerous-than-an-idea-when-you-have-only-one-idea-390165 (retrieved 10/30/18).

“Mortal danger is an effective antidote for fixed ideas.”
Variant: Mortal danger is an effective antidote for fixed ideas.
Source: The Rommel Papers (1953), Ch. XI : The Initiative Passes, p. 244.

“There’s nothing more dangerous than a good idea.”
Ron English's Fauxlosophy (2016)